source: GTP/trunk/App/Demos/Geom/OgreStuff/include/OgreParticleSystemRenderer.h @ 1092

/*
-----------------------------------------------------------------------------
This source file is part of OGRE 
(Object-oriented Graphics Rendering Engine)
For the latest info, see http://www.ogre3d.org/

Copyright (c) 2000-2005 The OGRE Team
Also see acknowledgements in Readme.html

This program is free software; you can redistribute it and/or modify it under 
the terms of the GNU Lesser General Public License as published by the Free Software 
Foundation; either version 2 of the License, or (at your option) any later 
version.

This program is distributed in the hope that it will be useful, but WITHOUT 
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with 
this program; if not, write to the Free Software Foundation, Inc., 59 Temple 
Place - Suite 330, Boston, MA 02111-1307, USA, or go to 
http://www.gnu.org/copyleft/lesser.txt.
-----------------------------------------------------------------------------
*/
#ifndef __ParticleSystemRenderer_H__
#define __ParticleSystemRenderer_H__

#include "OgrePrerequisites.h"
#include "OgreStringInterface.h"
#include "OgreFactoryObj.h"
#include "OgreRenderQueue.h"

namespace Ogre {

    /** Abstract class defining the interface required to be implemented
        by classes which provide rendering capability to ParticleSystem instances.
    */
    class _OgreExport ParticleSystemRenderer : public StringInterface
    {
    public:
        /// Constructor
        ParticleSystemRenderer() {}
        /// Destructor
        virtual ~ParticleSystemRenderer() {}

        /** Gets the type of this renderer - must be implemented by subclasses */
                virtual const String& getType(void) const = 0;

                /** Delegated to by ParticleSystem::_updateRenderQueue
        @remarks
            The subclass must update the render queue using whichever Renderable
            instance(s) it wishes.
        */
        virtual void _updateRenderQueue(RenderQueue* queue, 
            std::list<Particle*>& currentParticles, bool cullIndividually) = 0;

        /** Sets the material this renderer must use; called by ParticleSystem. */
        virtual void _setMaterial(MaterialPtr& mat) = 0;
        /** Delegated to by ParticleSystem::_notifyCurrentCamera */
        virtual void _notifyCurrentCamera(Camera* cam) = 0;
        /** Delegated to by ParticleSystem::_notifyAttached */
        virtual void _notifyAttached(Node* parent, bool isTagPoint = false) = 0;
        /** Optional callback notified when particles are rotated */
        virtual void _notifyParticleRotated(void) {}
        /** Optional callback notified when particles are resized individually */
        virtual void _notifyParticleResized(void) {}
        /** Tells the renderer that the particle quota has changed */
        virtual void _notifyParticleQuota(size_t quota) = 0;
        /** Tells the renderer that the particle default size has changed */
        virtual void _notifyDefaultDimensions(Real width, Real height) = 0;
                /** Create a new ParticleVisualData instance for attachment to a particle.
                @remarks
                        If this renderer needs additional data in each particle, then this should
                        be held in an instance of a subclass of ParticleVisualData, and this method
                        should be overridden to return a new instance of it. The default
                        behaviour is to return null.
                */
                virtual ParticleVisualData* _createVisualData(void) { return 0; }
                /** Destroy a ParticleVisualData instance.
                @remarks
                        If this renderer needs additional data in each particle, then this should
                        be held in an instance of a subclass of ParticleVisualData, and this method
                        should be overridden to destroy an instance of it. The default
                        behaviour is to do nothing.
                */
                virtual void _destroyVisualData(ParticleVisualData* vis) { assert (vis == 0); }

                /** Sets which render queue group this renderer should target with it's
                        output.
                */
                virtual void setRenderQueueGroup(RenderQueueGroupID queueID) = 0;


    };

    /** Abstract class definition of a factory object for ParticleSystemRenderer. */
    class _OgreExport ParticleSystemRendererFactory : public FactoryObj<ParticleSystemRenderer>
    {
    public:
        // No methods, must just override all methods inherited from FactoryObj
    };

}

#endif